the equivilent of the First() function is SELECT TOP 1 COLUMNNAME from sometable order by COLUMNNAME ;
the TOP function can give you the top 10 like david letterman, or return a percent of the values:
SELECT TOP 15 PERCENT * FROM SOMETABLE
without an explicit order by in your statement, it would be the first # of records, so make sure you always use an ORDER BY statement to get the results you want.
Lowell